my ipod touch wont change backgrounds, does anyone know how to fix it??

hey there. my ipod touch was jail broken before, when the itunes came out with applications i restored my ipod and un-jail broke it i guess. i changed my background using customize and apparently i left the "lockbaground" option on. i no longer have access to customize or any apps like that, from what i know. anyways i recently got a new ipod and just updated it, and the background is exactly the same as it was before and it still wont change. i can set a new background all i want but it doesn't change. someone needs to help pleassseeee. thank you and i appreciate it dearly.